Abstract: HU Xu,who was born at the beginning of Qing Dynasty,devoted all his life to researching Zhouyi and made a remarkable achievement.By accepting the essence of the research on Zhouyi in Han and Song Dynasties,and integrating the theories of astronomy and mathematics,he put forward many penetrative and distinctive concepts,including the criticism on ZHU Xi's study on Zhouyi, which is an important part of his ideas about Zhouyi.In this thesis,the author distinguishes and analyzes the difference between Hu Xu's a...